1. Compute SHA-256 of OTSCanonicalRecord value → must equal OTSHash 2. Open OTSProofURL → extract Bitcoin block number → must equal OTSBitcoinBlock 3. GET OTSBitcoinBlockVerifyURL → returns the Bitcoin block hash at height OTSBitcoinBlock; GET https://blockstream.info/api/block/{that hash} → its timestamp must match OTSTimestamp 4. Read CopyrightID inside OTSCanonicalRecord → must equal the CopyrightID above 5. GET OTSVerificationAPI → pre-computed 6-check result from server 6. If all match: this entity was registered on CopyrightChains at OTSTimestamp, independently verifiable on Bitcoin Note: an OTS proof may carry multiple Bitcoin attestations; OTSBitcoinBlock is the earliest confirmed one — a later attestation inside the proof corroborates it and is not a mismatch
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x67bd879759ac683630e5640120f7a32fda915eeae8f3e5adc702ddbf60153574. Chain 2 (Bitcoin): anchored in block 953408 (2026-06-12T19:28:13Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/c996d456-ef2e-4f23-a139-4833fc65e66e.json and https://artists.proofprofile.net/proofs/artist/c996d456-ef2e-4f23-a139-4833fc65e66e.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
1. Confirm isrcCode identifies the recording in the pre-2022 source corpus and cc-db-prod record 2. GET OTSVerificationAPI → server-side canonical-record, hash, and attestation checks must pass 3. GET OTSBitcoinBlockVerifyURL → returns the Bitcoin block hash at height OTSBitcoinBlock; GET https://blockstream.info/api/block/{that hash} → its timestamp must match OTSTimestamp 4. Confirm CopyrightID is the CopyrightChains transaction hash 5. If all match: the cc-db-prod record is independently anchored on Bitcoin at OTSTimestamp Note: an OTS proof may carry multiple Bitcoin attestations; OTSBitcoinBlock is the earliest confirmed one — a later attestation inside the proof corroborates it and is not a mismatch
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x16ea5bc48b9ab43870d674ff56b073ecdc88c0ba788f50f5df96f4c658caaf47. Chain 2 (Bitcoin): anchored in block 957709 (2026-07-12T13:52:43Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/QZTB92240764.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd0f6b45fcdcbeb8967ec5c2bad3044c71eaebc4b6adf0465d6a599168e1d93a0. Chain 2 (Bitcoin): anchored in block 959087 (2026-07-22T02:05:55Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/QZHN82361894.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x63b94f2e5c4952c84723c3217449af87cdb8eba3d4585e7f9fec5e0610b69a86. Chain 2 (Bitcoin): anchored in block 958166 (2026-07-15T15:55:19Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/QZMHM2451545.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xebb69bb8b4fd00cdc4206c0e5a7fcaf6ab1ee5fae7fbba7e9a357958db083b5d. Chain 2 (Bitcoin): anchored in block 958268 (2026-07-16T08:56:51Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/GB8KE2409811.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6362520636c6cd3351abee7a79786ec9d21c42f560c886f7cd2f2b2db6e7a678. Chain 2 (Bitcoin): anchored in block 956822 (2026-07-05T18:48:28Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/GB8KE2414277.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x42dba100c2721eff0862582c1edaa04949ea36b1185378352462f72fb7aabcbf. Chain 2 (Bitcoin): anchored in block 959084 (2026-07-22T00:50:00Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/QZNWY2430120.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe28784ab6d4f57066b2a3b687ef2d346df1aa43ba60654568022641fb4205601. Chain 2 (Bitcoin): anchored in block 959096 (2026-07-22T03:48:36Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/UK44M2400175.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x08c8e9e4f2c103af8047e393c11b95ddf659ee8e16ce5aa49526539b5543b43a. Chain 2 (Bitcoin): anchored in block 957011 (2026-07-07T08:25:35Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/GB8KE2428287.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x107589801f5e253527ebb5ebb9a6fa7eecd5259622da67bc3c07a25fe7705150. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/GB8KE2501049.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfa73820bdef9856537df07e808f0eef715a119f6b839436e903214ee451352ad. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/GB8KE2501050.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcb6fea10d54a2fbc2756cc47b8043753217f999b41eed044c7579cbecd89622d. Chain 2 (Bitcoin): anchored in block 960144 (2026-07-29T21:09:47Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/GB8KE2501051.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd8f7fb3dad5fdc9b166590c51ea5539487315dcd7b32d7f3e7db3e42c990fa7e. Chain 2 (Bitcoin): anchored in block 958060 (2026-07-14T20:39:42Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/GXE2S2500012.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7a0f1f473f3c81ff90ff0d8baae060760cc759fb44f5e70cf70a43ec6bc87695. Chain 2 (Bitcoin): anchored in block 958373 (2026-07-17T06:09:33Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/AUCN32500303.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7a0f1f473f3c81ff90ff0d8baae060760cc759fb44f5e70cf70a43ec6bc87695. Chain 2 (Bitcoin): anchored in block 959128 (2026-07-22T12:33:25Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/AUCN32500303.